“Check your oil for antifreeze contamination. The obvious culprits are intake or head gasket leaks.”
No way for an intake manifold gasket to cause this issue on a Pontiac.
I cannot see coolant going into the chamber, more so the situation would be combustion pressure to the cooling system.
It’s most likely Residual coolant, oil on guides from install, the anti corrosion spay from the machine shop, and the normal moisture condensating from the exhaust…amplified visibility on a cold day. Keep an eye on the cooling system….and
Run It!
✌🏼
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